/*
 * Created on 22 Jun 2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.networkmanager.impl.udp;

import java.nio.ByteBuffer;

import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.logging.LogIDs;

import com.aelitis.azureus.core.networkmanager.TransportEndpoint;
import com.aelitis.azureus.core.networkmanager.TransportStartpoint;
import com.aelitis.azureus.core.networkmanager.impl.TransportHelperFilter;
import com.aelitis.azureus.core.networkmanager.impl.TransportImpl;

public class UDPTransport extends TransportImpl {
    private static final LogIDs LOGID = LogIDs.NET;

    private ProtocolEndpointUDP endpoint;
    private byte[][] shared_secrets;

    private int transport_mode = TRANSPORT_MODE_NORMAL;

    private volatile boolean closed;

    protected UDPTransport(ProtocolEndpointUDP _endpoint, byte[][] _shared_secrets) {
        endpoint = _endpoint;
        shared_secrets = _shared_secrets;
    }

    protected UDPTransport(ProtocolEndpointUDP _endpoint, TransportHelperFilter _filter) {
        endpoint = _endpoint;

        setFilter(_filter);
    }

    public boolean isTCP() {
        return (false);
    }

    public boolean isSOCKS() {
        return (false);
    }

    public String getProtocol() {
        return "UDP";
    }

    public TransportEndpoint getTransportEndpoint() {
        return (new TransportEndpointUDP(endpoint));
    }

    public TransportStartpoint getTransportStartpoint() {
        return (null);
    }

    public int getMssSize() {
        return (UDPNetworkManager.getUdpMssSize());
    }

    public String getDescription() {
        return (endpoint.getAddress().toString());
    }

    public void setTransportMode(int mode) {
        transport_mode = mode;
    }

    public int getTransportMode() {
        return (transport_mode);
    }

    public void connectOutbound(ByteBuffer initial_data, final ConnectListener listener, int priority) {
        if (!UDPNetworkManager.UDP_OUTGOING_ENABLED) {

            listener.connectFailure(new Throwable("Outbound UDP connections disabled"));

            return;
        }

        if (closed) {

            listener.connectFailure(new Throwable("Connection already closed"));

            return;
        }

        if (getFilter() != null) {

            listener.connectFailure(new Throwable("Already connected"));

            return;
        }

        if (COConfigurationManager.getBooleanParameter("Proxy.Data.Enable")) {

            listener.connectFailure(new Throwable("UDP proxy connection not supported"));

            return;
        }

        UDPConnectionManager con_man = UDPNetworkManager.getSingleton().getConnectionManager();

        con_man.connectOutbound(this, endpoint.getAddress(), shared_secrets, initial_data, listener);
    }

    public void close(String reason) {
        closed = true;

        readyForRead(false);
        readyForWrite(false);

        TransportHelperFilter filter = getFilter();

        if (filter != null) {

            filter.getHelper().close(reason);

            setFilter(null);
        }
    }

    public boolean isClosed() {
        return (closed);
    }
}
